A government ministry says 486 people have been killed but a senior police officers told the AFP news agency:

"We have at least 600 dead... some bodies are still in the bushes where fighting occurred."

Mr Odinga said he understood that Ghana's President John Kufuor, current chairman of the African Union, would also be going to Kenya soon for talks.

Last week, the government said there was no need for Mr Kufuor to go to Kenya.

Many in need

Mr Kibaki has offered to form a "government of national unity" but Mr Odinga says the president must step down.

The BBC's Peter Greste says there is no sign of this and there remains a large gap between the two sides' positions.

The government says it has deployed its military engineering unit to assist in unblocking the main highways to enable relief supplies to be delivered to displaced people, and for public transport to resume.

The head of the humanitarian services committee, Rachael Arunga, told a news conference in Nairobi that sufficient supplies were yet to reach thousands of displaced people in urgent need.

Ms Arunga said the Rift Valley province was the worst hit area and efforts were being made to deliver food items, tents and medicine to the displaced people.

Seven people were killed in a shoot-out at a police station on Sunday and there have been further clashes in Mombasa.

European Union observers have criticised the way some of the votes were counted, including anomalies between the results announced locally and nationally.